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Subsequent Events (Details) - Subsequent Events - USD ($)
Oct. 27, 2020
Oct. 12, 2020
Public Offering | Unsecured senior notes | 7.875% Senior Notes    
Subsequent Events    
Aggregate principal amount of notes issued $ 60,000,000  
Percentage of notes sold 100.00%  
Minimum denominations $ 25,000  
Integral multiples $ 25,000  
Interest rate 7.875%  
Over allotment | Unsecured senior notes | 7.875% Senior Notes    
Subsequent Events    
Aggregate principal amount of notes issued $ 9,000,000  
Period for an option to purchase additional notes 30 days  
Series C Preferred Stock    
Subsequent Events    
Cash dividend, per share   $ 2.30